Rockwell Automation PLC-5 Fieldbus Solutions for Integrated Architecture User Manual - Manual (Page 51)

Publication 1757-UM006A-EN-P - May 2002
Integrating Fieldbus into Rockwell Automation Logix System 2-7
About the Device Object
The device object represents a physical device entity connected to the
fieldbus link. It provides access to the device's Network Management
(NM) and System Management (SM) parameters. The client/server
VCR is configured in the FIM to access the Management Interface Base
(MIB) of the device as soon as it joins the network. The Control
Builder does not configure the MIB VCR explicitly. Once the MIB VCR
is configured and opened, FIM retrieves MIB information,
SMdirectory, and NM directory. Knowledge of these directories allows
FIM to transform writes into domain object variables into proper
sequence of domain download operations. The SM directory is also
used to determine the number of application VFDs. The NM directory
is key in attempting to configure VCRs to access Function Block
Application Process VFDs in the device.
About the VFD Object
The Virtual Field Device object represents an application VFD and
provides parameter access to that VFD. Each physical device may
have one or more application VFDs. The FIM attempts to build a
client/server VCR to every VFD in the device, when it is added to the
network. If the VCR configuration is successful, the FIM obtains VFD
and resource identification from the device's VFD. During device
download, you can overwrite VCR configuration used to access VFD
parameters through the Control Builder application.
Fieldbus Device Analog Input Integration
A user can functionally wire the output from an Analog Input (AI)
function block in a fieldbus device residing on an H1 link to the input
of a regulatory control type function block contained in a Control
Module in the ProcessLogix Control Builder application. The
Proportional, Integral, Derivative (PID) function block is a typical
regulatory control type function block.
The Fieldbus Library Manager (FLM) in ProcessLogix R400.0 Control
Builder makes this possible. The FLM reads the manufacturer's DD for
the fieldbus device and creates a device template that is included in
the Project tab of Control Builder. The device template includes the
device's fieldbus function blocks, so it can be configured and
integrated with control strategies through Control Builder.